Neso’s job is to make sure supply meets the UK’s essential energy demands every day of the week.
Analysts at its Electricity National Control Centre have been forecasting what could happen during the World Cup, which starts later this month.
Scotland’s first game, against Haiti on 14 June, kicks off at 02:00, followed by 23:00 starts against Morocco on 19 June and Brazil on 24 June.
England’s matches against Croatia on 17 June and Ghana on 23 June both kick off at 21:00, before taking on Panama on 27 June at 22:00.
Both countries will play their group games in the US.
Neso said England’s opening match against Croatia would likely draw the biggest audience.
It said energy demand could rise by as much as 800MW – higher than the 600MW spike during England’s 1966 World Cup win.
Neso said demand would be expected to increase even more the further England and Scotland go in the tournament, with the biggest games attracting the most viewers.
The current record was set during England’s 1990 semi-final against West Germany, when a missed penalty in the shootout was followed by a 2,800MW surge – the equivalent to more than a million kettles being switched on at once.
